LCP
Largest Contentful Paint
3.0s
Needs Improvement
Good: < 2.5s
Measures how long it takes for the main content to appear on screen
Improve First Contentful Paint
How to optimize pixelvault.dev
Ruby on Rails SiteScore: 86/100Analyzed February 2026
Improve First Contentful Paint
High Impact+12 points estimated
Why It Matters
Your FCP of 3.0 seconds is significantly above the recommended 1.8 seconds, delaying when users see content.
How to Fix
Enable Rails fragment caching for your main content areas using cache helpers. Implement critical CSS inlining in your application layout. Use Rails' preload_link_tag for critical resources and defer non-essential stylesheets.
0Needs Improvement
What This Score Means
A score of 86 falls in the "Needs Improvement" range (50-89). While it is better than poor (0-49), you should aim for 90+ to provide an optimal user experience and maximize SEO benefits.
This site is slower than approximately 35% of similar sites. The main issues affecting performance are image optimization, JavaScript execution time, and layout stability.
Addressing these issues could improve your conversion rate by 15-20% and boost your search engine rankings.
Core Web Vitals Analysis
INP
Interaction to Next Paint
16ms
Good
Good: < 200ms
Measures how quickly the page responds to user interactions
CLS
Cumulative Layout Shift
0.00
Good
Good: < 0.1
Measures visual stability - how much content shifts during page load
AI Performance Analysis
This Ruby on Rails site has good performance with a score of 86/100, but there's still room for improvement. The biggest issue is the slow First Contentful Paint at 3.0 seconds, which means users wait too long to see any content appear on the page. The main culprit is unused JavaScript from the Turbo framework, where 86% of the loaded code (25 KiB) isn't actually being used and is also causing forced reflows that slow down page rendering. Removing or deferring this unused JavaScript could significantly speed up initial page loading and improve the user experience.
Other Optimization Recommendations
Optimize Turbo.js JavaScript Bundle
High Impact+8 points estimatedWhy It Matters:
Your Turbo.js file has 85% unused code (25KB waste) causing forced reflows that delay rendering by 94ms.
How to Fix:
Configure your Rails asset pipeline to tree-shake unused Turbo modules. Use import maps with selective imports instead of the full bundle. Consider lazy-loading ActionCable if not needed on initial page load. Add webpack-bundle-analyzer to identify specific unused modules.
Eliminate Forced DOM Reflows
Medium Impact+6 points estimatedWhy It Matters:
Turbo.js is causing 61ms of forced reflows that block the main thread and delay interactivity.
How to Fix:
Update to the latest Turbo version which has better performance optimizations. Use CSS transforms instead of layout-triggering properties in animations. Batch DOM reads and writes in custom JavaScript to avoid layout thrashing.
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Related Performance Analyses
More Ruby on Rails Speed Tests
Ruby on Rails Performance Resources
Reduce Unused Code Payload
2.2MB of unused JavaScript and 485KB unused CSS waste bandwidth and slow parsing.
Fix Critical Layout Shifts
Layout shifts score of 1.03 severely impacts user experience and Core Web Vitals.
Add Image Dimensions and Fonts
Missing width/height attributes cause layout shifts during load, hurting CLS and user experience.
Optimize Image Compression and Sizing
Images are oversized and poorly compressed, wasting 25KB of bandwidth and slowing page load.
Frequently Asked Questions
Keep Your Site Fast After Optimization
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